Other Infectious Diseases Monitored by WHO Through Disease Outbreak News and Weekly Epidemiological Reports
Other Infectious Diseases Monitored by WHO Through Disease Outbreak News and Weekly Epidemiological Reports | The spread of infectious diseases remains an important global health
concern. Diseases can cross borders rapidly through travel, migration, trade, environmental changes, and other factors. Because of this, early detection and continuous epidemiological monitoring are essential for protecting communities and reducing the risk of large outbreaks.
The World Health Organization monitors a wide range of infectious diseases through global surveillance systems. Two important sources of epidemiological information are Disease Outbreak News and the Weekly Epidemiological Record.
These publications can highlight newly detected outbreaks, unusual disease events, emerging infections, and developments involving diseases that continue to pose public health risks.
What Is Disease Outbreak News?
Disease Outbreak News is used to communicate important information about significant public health events.
The information may cover an outbreak in a particular country, a cross-border health event, or an emerging infectious disease that requires international attention.
The reports can provide information about:
- The location of an outbreak
- The disease involved
- Reported cases
- Deaths and severe illness
- How the disease is spreading
- Public health measures
- Risk assessments
- Developments in surveillance
The purpose is not to create unnecessary alarm but to help governments, health professionals, and the public understand important developments.
What Is the Weekly Epidemiological Record?
The Weekly Epidemiological Record is a long-running WHO publication dedicated to epidemiological information.
It covers outbreaks and other communicable diseases that have public health importance, including infections that are emerging or returning after periods of lower activity.
Recent weekly reporting has included signals involving diseases such as cholera, mpox, dengue, measles, malaria, yellow fever, Lassa fever, Japanese encephalitis, hantavirus disease, and other infectious threats.
The range of diseases demonstrates that global disease surveillance must cover many different pathogens rather than focusing on only one major outbreak.
Cholera
Cholera remains an important infectious disease monitored internationally.
It is caused by bacteria that can spread through contaminated water or food. Outbreaks are particularly dangerous in areas where access to clean water, sanitation, and healthcare is limited.
Symptoms can include severe watery diarrhea and vomiting. Without rapid treatment, severe dehydration can become life-threatening.
Because cholera can spread quickly within affected communities, early reporting and public health intervention are essential.
Mpox
Mpox continues to receive international surveillance because transmission can occur in different populations and geographic areas.
The disease can cause fever, swollen lymph nodes, fatigue, and characteristic skin lesions. The severity can vary between individuals.
WHO monitoring helps health authorities understand where transmission is occurring and whether changes in epidemiological patterns require additional public health action.
Dengue
Dengue is another major infectious disease monitored globally.
It is primarily transmitted by infected mosquitoes, particularly species of Aedes mosquitoes that are common in tropical and subtropical environments.
Dengue can produce high fever, severe headache, muscle and joint pain, and other symptoms. Some infections can develop into severe dengue, which may require urgent medical treatment.
Urbanization, climate conditions, mosquito populations, and international travel can all influence dengue transmission.
Measles
Measles remains a major concern because it is highly contagious.
The disease can spread rapidly when vaccination coverage falls and susceptible populations increase.
Symptoms commonly include fever, cough, runny nose, and a widespread rash. Complications can be serious, particularly among young children and people with weakened immune systems.
Monitoring measles outbreaks helps public health authorities identify areas where vaccination programs may need to be strengthened.
Malaria
Malaria continues to affect millions of people in tropical and subtropical regions.
It is caused by parasites transmitted through the bites of infected mosquitoes. Although malaria is preventable and treatable, it can become severe and potentially fatal.
WHO surveillance helps track changes in malaria transmission and supports efforts involving prevention, diagnosis, treatment, and vector control.
Yellow Fever
Yellow fever is a mosquito-borne viral disease found in parts of Africa and South America.
Many infections are mild, but severe cases can cause jaundice, bleeding, organ failure, and other life-threatening complications.
Because international travel can move infected people between regions where mosquitoes are present, monitoring yellow fever remains an important part of global health surveillance.
Lassa Fever
Lassa fever is a viral hemorrhagic disease primarily associated with parts of West Africa.
Transmission can occur through exposure to infected rodents or contact with bodily fluids from an infected person.
Many infections may be mild or asymptomatic, but severe cases can produce serious complications.
Regular surveillance is important because early recognition can support infection-control measures and appropriate medical care.
Hantavirus Disease
Hantaviruses are another group of pathogens monitored by health authorities.
Human infection can occur after exposure to environments contaminated with infected rodent urine, droppings, or saliva, depending on the virus involved.
Different hantaviruses can cause different clinical syndromes, including severe respiratory or kidney-related illness.
Because some cases may initially resemble other diseases, epidemiological investigations are important for identifying clusters and potential sources of exposure.
Japanese Encephalitis
Japanese encephalitis is a mosquito-borne viral disease that occurs primarily in parts of Asia and the Western Pacific.
Most infected people do not develop severe symptoms, but a small proportion can develop inflammation of the brain.
Vaccination, mosquito control, and surveillance are important tools for reducing the health impact of the disease.
Zika Virus Disease
Zika virus is mainly transmitted by Aedes mosquitoes.
In many people, infection produces mild symptoms or no symptoms at all. However, Zika is particularly important because infection during pregnancy can cause serious congenital complications.
Monitoring Zika activity is therefore important for both infectious disease control and maternal and child health.
Avian and Animal Influenza Viruses
WHO also monitors influenza viruses that circulate among birds and other animals.
Some animal influenza viruses can occasionally infect humans. When this occurs, health authorities closely examine the circumstances of transmission.
Surveillance is important because influenza viruses can evolve over time. Detecting unusual infections early allows authorities to investigate whether there is evidence of sustained person-to-person transmission.
Viral Hemorrhagic Fevers
Viral hemorrhagic fevers include several diseases caused by different viruses.
Examples include Ebola disease, Marburg virus disease, Lassa fever, and Crimean-Congo hemorrhagic fever.
These diseases vary in their transmission routes and severity, but some can cause serious illness and death.
Rapid detection is particularly important because infection-control measures can help prevent healthcare-associated and community transmission.
Crimean-Congo Hemorrhagic Fever
Crimean-Congo hemorrhagic fever is a tick-borne viral disease that occurs in several regions of the world.
People can become infected through tick bites or contact with infected animal blood and tissues. Human-to-human transmission can also occur through exposure to infected bodily fluids.
Healthcare workers can face particular risks when treating patients without appropriate infection-prevention measures.
Why Weekly Epidemiological Monitoring Matters
Disease surveillance is not simply about counting cases.
Public health experts also examine patterns and changes.
They may ask:
- Is the number of cases increasing?
- Is transmission occurring in a new location?
- Are unusual symptoms being reported?
- Are severe cases becoming more common?
- Is a disease appearing in a population that was previously unaffected?
- Is there evidence of international spread?
- Are existing prevention measures working?
Answers to these questions help authorities decide whether additional investigations or interventions are necessary.
Emerging and Re-Emerging Diseases
An important part of modern disease surveillance is recognizing infections that are emerging or re-emerging.
An emerging disease may involve a pathogen that has newly appeared in humans or is expanding into a new geographic area.
A re-emerging disease may be an infection that was previously under control but begins increasing again.
Changes in climate, environmental conditions, human behavior, urbanization, wildlife interactions, international travel, and healthcare systems can influence these patterns.
The Importance of Early Detection
Early detection can make a major difference during an outbreak.
When health authorities identify an unusual cluster quickly, they may be able to investigate the source, identify contacts, improve infection prevention, provide treatment, and communicate risks before transmission becomes widespread.
This is why global surveillance networks are essential.
A disease event that initially appears to affect only a small community can become an international concern if the pathogen spreads efficiently across borders.
Public Awareness and Responsible Information
Public access to epidemiological information is also important.
However, information about outbreaks should be interpreted carefully.
An infectious disease appearing in a surveillance report does not automatically mean that a global emergency is occurring. Surveillance systems are designed to detect potential threats, including events that may ultimately remain limited.
People should therefore avoid relying on social media rumors or unverified claims when evaluating health risks.
Reliable epidemiological information is most useful when it is presented with appropriate context.
The infectious diseases monitored through WHO surveillance illustrate the complexity of global public health.
Cholera, mpox, dengue, measles, malaria, yellow fever, Lassa fever, hantavirus disease, Japanese encephalitis, Zika virus disease, influenza viruses, and viral hemorrhagic fevers represent only part of the broad range of infections that require continuous observation.
Disease Outbreak News and weekly epidemiological reporting help provide a clearer picture of where unusual health events are occurring and how infectious disease patterns are changing.
The ultimate purpose of this surveillance is early recognition and informed action. By detecting potential threats, assessing their significance, and communicating relevant developments, global health systems can respond more effectively to infectious diseases and reduce their potential impact on communities.